Limequat is correct, just expand adjacent there is no real right or wrong way to do it. However, are You actually thinking this us a separated island? it is not. dawn tree is simply the tree you see on the regular map expanding around it does not do anything special for you. The dawn tree goals are related to accomplishments when you breed or raise dragons of each of the primary colours. For example when you have ten dragons with a red element you can buy the perked dawntree building which is up liked at that gp time and will be shown under buildings. Rpthere is a cost and it is not free. Each building will enhance your habitats that contain that color. As another example the red unlocks the Eternal Flame building and once it's placed all dragons in red habitats only, will earn ten % more coin a This does not app,y to the special dual and trio habitats that you buy but only single habitats. There are dawn tree buildings for red, yellow, green, purple and white. assuming you are inky using the coin habitats the white gives the biggest bonus and you will be really happy once you have it. Of course eventually once coin is no longer an issue you will likely sell them, but they are of great help for an interim period. If you have more questions about the dawn tree goals feel free to ask me privately or here. I hope this helps.